Workshops, Conference papers, Panels, etchttp://hdl.handle.net/10394/31252016-12-09T15:42:23Z2016-12-09T15:42:23ZDesign and cost analysis of an automation system for swimming poolsGouws, RupertNieuwoudt, Abriehttp://hdl.handle.net/10394/181162016-08-01T11:03:30Z2012-01-01T00:00:00ZDesign and cost analysis of an automation system for swimming pools
Gouws, Rupert; Nieuwoudt, Abrie
A low-cost automation system to minimise energy consumption
of circulation pumps and to regulate the chemical
composition of the water in swimming pools
2012-01-01T00:00:00ZFly ash resistivity profiling for South African coal fired power stationsChauke, GeraldGouws, Ruperthttp://hdl.handle.net/10394/181042016-07-29T09:09:04Z2013-01-01T00:00:00ZFly ash resistivity profiling for South African coal fired power stations
Chauke, Gerald; Gouws, Rupert
Particulate emission is a major problem in industrial processes, mainly power plants that make use of coal as a primary
source of energy. Stringent emissions limits, set by government organisations requires industries to conform to these limits to ensure
that air quality is sustained and with minimum pollutant present. Electrostatic precipitators are typically used to filter and collect these
particulate emissions. Fly ash resistivity is a primary parameter in the collection of particulate emissions, and there is a resistivity range
at which electrostatic precipitator collection is most efficient and anything outside this range limits, their operation. High resistivity ash
results in back-corona discharge, whilst low resistivity results in particle re-entrainment into the flue gas stream. The purpose of this
paper is to investigate and obtain a fly ash resistivity profile for existing power plants in South Africa. Ash samples obtained from
power plants are, tested making use of an ash-resistivity test oven, in accordance with IEEE Standard 548-1984. This paper discusses
obtained experimental results, to determine the resistivity profile at which South African power plant electrostatic precipitators operate.
The electrical efficiency of the electrostatic precipitator system is evaluated based on the obtained resistivity profiles
2013-01-01T00:00:00ZInvestigation and efficiency analysis: 405 km transmission line with series compensationGouws, R.http://hdl.handle.net/10394/180802016-07-28T09:23:28Z2012-01-01T00:00:00ZInvestigation and efficiency analysis: 405 km transmission line with series compensation
Gouws, R.
This article presents an investigative case study and efficiency analysis of the 405 km, 420 kV transmission line between Insukamini substation
in Bulawayo, Zimbabwe and the Matimba thermal power station in South Africa (which is routed through Botswana)
2012-01-01T00:00:00ZEfficiency analysis of an induction motor with direct torque and flux control at a hot rolling millGouws, Ruperthttp://hdl.handle.net/10394/180612016-07-28T09:37:23Z2015-01-01T00:00:00ZEfficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill
Gouws, Rupert
This paper presents an efficiency analysis of an
induction motor with direct torque and flux control
at a hot rolling mill in South Africa. Two scenarios
were evaluated: 1) where the induction motor was
controlled at a constant speed with a variable thickness
slab; and 2) where the speed of the induction
motor was controlled according to the thickness of
the slab. Both scenarios used the speed as reference
to control the torque and flux of the induction
motor. A comparison on the energy consumption of
the induction motor for both scenarios was done by
means of a detailed simulation model. The simulation
model for this specific case study is explained in
detail. The results obtained showed an increase in
the efficiency of the induction motor from the original
system (scenario 1) to the improved system (scenario
2). Part of this paper provides an overview on
hot rolling mills
2015-01-01T00:00:00Z